Who was the best, Man O'War or Secretariat?

As long as there are racing fans and history buffs, the controversy will always rage: Who was better, Man O'War or Secretariat? Both were nicknamed "Big Red", both kicked their competition around like they were in a class by themselves. Which one was best has long been debated with very passionate opinions being given by both sides. Who do you think was the best? Here is some info for you to check out before you make your decision.